Abstract: A new kind of specimen was designed and produced to research the dynamic bond-strength of the interface between steel and cement mortar experimentally and numerically. The relationship of the loading speed rate and the bond-strength of the interface between steel and cement mortar was investigated through quasi-static and impact experiments. Numerical calculation was carried out by using LS-DYNA software and Johnson-Holmquist-Cook model as the constitutive relationship of cement mortar material. By calculation the process and mechanism of the fracture of the interface under impact loading was studied and the credibility and reliability of the impact experiment method based on the SHPB experiment technique are verified. It can be concluded that the bond-strength is roughly linear with the logarithm of the loading speed rates.

Key words: FEM, Johnson-Holmquist-Cook model, cement mortar, bond-strength

摘要： 设计和制作了一种用以考察钢和水泥砂浆石界面动态粘结强度的新型试件，并开展了实验和计算研究工作。通过准静态实验与冲击实验，研究了钢-水泥砂浆石界面粘结强度随加载速率的提高而产生的变化。计算工作以LS-DYNA软件为有限元计算平台，选用Johnson-Holmquist-Cook模型作为水泥砂浆石材料的本构模型。通过计算分析了冲击载荷下界面破坏的过程和机理，并验证了基于split hopkinson pressure bar(SHPB)实验技术的冲击实验方法的可行性和可靠性。研究结果表明界面粘结强度与加载速率的对数大致成线性关系。

关键词: 有限元法, Johnson-Holmquist-Cook模型, 水泥砂浆石, 粘结强度